lightnvm: check mm before use

The core can may issue I/Os before a media manager is registered with
the lightnvm subsystem. Make sure that we don't call the media manager
->end_io prematurely with a null pointer.

Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
index 06c3364..762c9a7 100644 (file)
--- a/drivers/nvme/host/lightnvm.c
+++ b/drivers/nvme/host/lightnvm.c
@@ -455,7 +455,7 @@ static void nvme_nvm_end_io(struct request *rq, int error)
        struct nvm_rq *rqd = rq->end_io_data;
        struct nvm_dev *dev = rqd->dev;
 
-       if (dev->mt->end_io(rqd, error))
+       if (dev->mt && dev->mt->end_io(rqd, error))
                pr_err("nvme: err status: %x result: %lx\n",
                                rq->errors, (unsigned long)rq->special);